Regardless of the outcome of Republican presidential primaries in Michigan and Arizona on Tuesday, Mitt Romney and Rick Santorum appear headed for a showdown next week in Ohio.
Both candidates plan to dash there later this week, and they and their allies already are spending heavy levels of money on advertising in the Buckeye State.
It's one of 10 that vote a week from Tuesday, with 419 delegates at stake of 1,144 needed to secure the nomination. Beyond Ohio, Romney was looking to contests in the West while Santorum focuses on the South.
Rival Newt Gingrich is working to make his stand in his home state of Georgia and nearby Southern states. Ron Paul also plans events in upcoming states.
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